4-1-4

# -*- coding: utf-8 -*-

from Autodesk.Revit.DB import FilteredElementCollector as FEC

map = doc.ParameterBindings
iterator = map.ForwardIterator()

param_elements = {}
while iterator.MoveNext():
    param_elements[iterator.Key.Id] = 0
    for cat in iterator.Current.Categories:
        if iterator.Current.ToString() == 'InstanceBinding':
            param_elements[iterator.Key.Id] += FEC(doc). \
                OfCategoryId(cat.Id).WhereElementIsNotElementType().GetElementCount()
        else:
            param_elements[iterator.Key.Id] += FEC(doc). \
                OfCategoryId(cat.Id).WhereElementIsElementType().GetElementCount()

lst_sorted = sorted(param_elements.values(), reverse=True)  # [137, 86, 82, 34, 30, 29, 25, 11, 0, 0]

param_sum, elem_sum = 0, 0
for key, value in param_elements.items():
    for i in range(3):
        if value == lst_sorted[i]:
            param_sum += key.IntegerValue
            elem_sum += value

print '{}, {}'.format(param_sum, elem_sum)

# 3281797, 305 - не верно